Photophysics of norharmane in micellar environments: a fluorometric study

Mallick, Arabinda ; Chattopadhyay, Nitin (2004) Photophysics of norharmane in micellar environments: a fluorometric study Biophysical Chemistry, 109 (2). pp. 261-270. ISSN 0301-4622

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Steady state photophysics of norharmane (NHM) has been studied in different aqueous micellar environments. In aqueous solution at pH 7, excitation of the neutral species promotes a rapid transfer of proton giving rise to the corresponding cationic emission. Aqueous micelles differing in their surface charge characteristics interact with the fluorophore differently. The dependence of the fluorescence of the probe molecule on different micelles has been exploited to determine the critical micellar concentrations (CMCs) of the surfactants. The binding constant (K) and free energy change (ΔG) for the interaction of norharmane with the micelles have been evaluated from the fluorescence data. The probable location of the probe in the micelles has also been suggested. Polarity of the microenvironment around the probe has been determined for CTAB and TX-100 micellar systems from a comparison of the variation of fluorescence properties of the two prototropic species in water-dioxane mixture with varying composition.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Photophysics; Norharmane; Critical Micellar Concentration; Microenvironment; Polarity
ID Code:67409
Deposited On:31 Oct 2011 04:53
Last Modified:31 Oct 2011 04:53

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